求解答,急需!!
1个回答
2014-12-23
展开全部
tan(e+π/4)
=[tane+tan(π/4)]/[1-tane*tan(π/4)]
=(tane+1)/(1-tane)
=3
则tane=1/2
cose=+-2/根号5
cos2e=2(cose)^2-1=8/5-1=3/5
=[tane+tan(π/4)]/[1-tane*tan(π/4)]
=(tane+1)/(1-tane)
=3
则tane=1/2
cose=+-2/根号5
cos2e=2(cose)^2-1=8/5-1=3/5
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